I started off by wanting to think of an adventure where the heroes had to be villains...not in the "We're killing everything in order to save it" way, but say as hired thugs to some bad guy.
Then I realized that I wanted to do it as troupe play, where everyone has two-and-a-half characters:
- Their hero, who is the primary character
- The bad guy based off the hero, who is the half character, and who the hero has to impersonate
- The other hero, assigned to bring in the bad guy because apparently the bad guy killed the main hero...
Would it work? I dunno. It's still a portion of an idea.